Home / 428,649.03-642,997.85-129,170.97

Finding the Fourth Proportional to 428,649.03, 642,997.85 and 129,170.97

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Solution

The fourth proportional to 428,649.03, 642,997.85 and 129,170.97 is: 193,763.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,649.03 : 642,997.85 = 129,170.97 : x
  2. Step 2: Convert to fraction form
    428,649.03/642,997.85 = 129,170.97/x
  3. Step 3: Cross multiply
    428,649.03x = 642,997.85 × 129,170.97
  4. Step 4: Simplify right side
    428,649.03x = 83,056,655,346.56
  5. Step 5: Solve for x
    x = 83,056,655,346.56/428,649.03
  6. Step 6: Final answer
    x = 193,763.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.